From: "Michael S. Tsirkin" <mst@redhat.com>
To: Frank Yang <lfy@google.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>,
Cornelia Huck <cohuck@redhat.com>,
Roman Kiryanov <rkir@google.com>,
Gerd Hoffmann <kraxel@redhat.com>,
Stefan Hajnoczi <stefanha@redhat.com>,
virtio-dev@lists.oasis-open.org,
Greg Hartman <ghartman@google.com>
Subject: Re: [virtio-dev] Memory sharing device
Date: Tue, 12 Feb 2019 23:19:01 -0500 [thread overview]
Message-ID: <20190212231458-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <20190212221738-mutt-send-email-mst@kernel.org>
On Tue, Feb 12, 2019 at 11:02:19PM -0500, Michael S. Tsirkin wrote:
> On Tue, Feb 12, 2019 at 06:50:29PM -0800, Frank Yang wrote:
> >
> >
> > On Tue, Feb 12, 2019 at 11:06 AM Michael S. Tsirkin <mst@redhat.com> wrote:
> >
> > On Tue, Feb 12, 2019 at 09:26:10AM -0800, Frank Yang wrote:
> > > BTW, the other unique aspect is that the ping messages allow a _host_
> > pointer
> > > to serve as the lump of shared memory;
> > > then there is no need to track buffers in the guest kernel and the device
> > > implementation can perform specialize buffer space management.
> > > Because it is also host pointer shared memory, it is also physically
> > contiguous
> > > and there is no scatterlist needed to process the traffic.
> >
> > Yes at the moment virtio descriptors all pass addresses guest to host.
> >
> > Ability to reverse that was part of the vhost-pci proposal a while ago.
> > BTW that also at least originally had ability to tunnel
> > multiple devices over a single connection.
> >
> >
> >
> > Can there be a similar proposal for virtio-pci without vhsot?
> >
> > There was nothing wrong with the proposals I think, they
> > just had to be polished a bit before making it into the spec.
> > And that runneling was dropped but I think it can be brought back
> > if desired, we just didn't see a use for it.
> >
> >
> > Thinking about it more, I think vhost-pci might be too much for us due to the
> > vhost requirement (sockets and IPC while we desire a highly process local
> > solution)
>
> I agree because the patches try to document a bunch of stuff.
> But I really just mean taking the host/guest interface
> part from there.
Tomorrow I'll try to write up a little bit more about the vhost pci
ideas. The patches on list go deep into envisioned implementation
detail within qemu instead of the actual host/guest interface.
You should then be able to figure out they are relevant for you.
--
MST
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next prev parent reply other threads:[~2019-02-13 4:19 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-01 20:34 [virtio-dev] Memory sharing device Roman Kiryanov
2019-02-04 5:40 ` Stefan Hajnoczi
2019-02-04 10:13 ` Gerd Hoffmann
2019-02-04 10:18 ` Roman Kiryanov
2019-02-05 7:42 ` Roman Kiryanov
2019-02-05 10:04 ` Dr. David Alan Gilbert
2019-02-05 15:17 ` Frank Yang
2019-02-05 15:21 ` Frank Yang
2019-02-05 21:06 ` Roman Kiryanov
2019-02-06 7:03 ` Gerd Hoffmann
2019-02-06 15:09 ` Frank Yang
2019-02-06 15:11 ` Frank Yang
2019-02-08 7:57 ` Stefan Hajnoczi
2019-02-08 14:46 ` Frank Yang
2019-02-06 20:14 ` Dr. David Alan Gilbert
2019-02-06 20:27 ` Frank Yang
2019-02-07 12:10 ` Cornelia Huck
2019-02-11 14:49 ` Michael S. Tsirkin
2019-02-11 15:14 ` Frank Yang
2019-02-11 15:25 ` Frank Yang
2019-02-12 13:01 ` Michael S. Tsirkin
2019-02-12 13:16 ` Dr. David Alan Gilbert
2019-02-12 13:27 ` Michael S. Tsirkin
2019-02-12 16:17 ` Frank Yang
2019-02-19 7:17 ` Gerd Hoffmann
2019-02-19 15:59 ` Frank Yang
2019-02-20 6:51 ` Gerd Hoffmann
2019-02-20 15:31 ` Frank Yang
2019-02-21 6:55 ` Gerd Hoffmann
2019-02-19 7:12 ` Gerd Hoffmann
2019-02-19 16:02 ` Frank Yang
2019-02-20 7:02 ` Gerd Hoffmann
2019-02-20 15:32 ` Frank Yang
2019-02-21 7:29 ` Gerd Hoffmann
2019-02-21 9:24 ` Dr. David Alan Gilbert
2019-02-21 9:59 ` Gerd Hoffmann
2019-02-21 10:03 ` Dr. David Alan Gilbert
2019-02-22 6:15 ` Michael S. Tsirkin
2019-02-22 6:42 ` Gerd Hoffmann
2019-02-11 16:57 ` Michael S. Tsirkin
2019-02-12 8:27 ` Roman Kiryanov
2019-02-12 11:25 ` Dr. David Alan Gilbert
2019-02-12 13:47 ` Cornelia Huck
2019-02-12 14:03 ` Michael S. Tsirkin
2019-02-12 15:56 ` Frank Yang
2019-02-12 16:46 ` Dr. David Alan Gilbert
2019-02-12 17:20 ` Frank Yang
2019-02-12 17:26 ` Frank Yang
2019-02-12 19:06 ` Michael S. Tsirkin
2019-02-13 2:50 ` Frank Yang
2019-02-13 4:02 ` Michael S. Tsirkin
2019-02-13 4:19 ` Michael S. Tsirkin [this message]
2019-02-13 4:59 ` Frank Yang
2019-02-13 18:18 ` Frank Yang
2019-02-14 7:15 ` Frank Yang
2019-02-22 22:05 ` Michael S. Tsirkin
2019-02-24 21:19 ` Frank Yang
2019-02-13 4:59 ` Frank Yang
2019-02-19 7:54 ` Gerd Hoffmann
2019-02-19 15:54 ` Frank Yang
2019-02-20 3:46 ` Michael S. Tsirkin
2019-02-20 15:24 ` Frank Yang
2019-02-20 19:29 ` Michael S. Tsirkin
2019-02-20 6:25 ` Gerd Hoffmann
2019-02-20 15:30 ` Frank Yang
2019-02-20 15:35 ` Frank Yang
2019-02-21 6:44 ` Gerd Hoffmann
2019-02-12 18:22 ` Michael S. Tsirkin
2019-02-12 19:01 ` Frank Yang
2019-02-12 19:15 ` Michael S. Tsirkin
2019-02-12 20:15 ` Frank Yang
2019-02-12 13:00 ` Michael S. Tsirkin
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